WU Rong-peng, ZHANG Xing-hua, WEI Xing-hai, JING De-qi, SU Wei-guo, ZHANG Shou-chun. Cardo poly (ether sulfone) toughened E51/DETDA epoxy resin and its carbon fiber composites[J]. New Carbon Mater., 2024, 39(4): 681-691. DOI: 10.1016/S1872-5805(23)60741-3
Citation: WU Rong-peng, ZHANG Xing-hua, WEI Xing-hai, JING De-qi, SU Wei-guo, ZHANG Shou-chun. Cardo poly (ether sulfone) toughened E51/DETDA epoxy resin and its carbon fiber composites[J]. New Carbon Mater., 2024, 39(4): 681-691. DOI: 10.1016/S1872-5805(23)60741-3

Cardo poly (ether sulfone) toughened E51/DETDA epoxy resin and its carbon fiber composites

  • A toughener that can effectively improve the interlaminar toughness in carbon fiber composites is crucial for various applications. We investigated, the toughening effects of phenolphthalein-based cardo poly (ether sulfone) (PES-C) on E51/ DETDA epoxy and its carbon fiber composites (CFCs). Scanning electron microscopy showed that the phase structures of PES-C/epoxy blends change from island (of dispersed phase) structures to bi-continuous structures (of the matrix) as the PES-C content increased, which is associated with reaction-induced phase separation. After adding 15 phr PES-C, the glass transition temperature (Tg) of the blends increased by 51.5 °C, and the flexural strength, impact strength and fracture toughness of the blends were improved by 41.1%, 186.2% and 42.7%, respectively. These improvements could be attributed to the phase separation structure of the PES-C/epoxy system. A PES-C film was used to improve the mode-II fracture toughness (GIIC) of CFCs. TheGIIC value of the 7 μm PES-C film toughened laminate was improved by 80.3% compared to that of the control laminate. The increase inGIIC was attributed to cohesive failure and plastic deformation in the interleaving region.
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